Which of the following is/ are used as disinfectant of water

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Which of the following is/ are used as disinfectant of water?

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[UPPSC 2016 P1]

A Ozone

ओजोन

B Chlorine dioxide

क्लोरिन डाइऑक्साइड

C Chloramine

क्लोरैमाइन

D All of the above

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